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platybasia

(plăt′ĭ-bāzhə)
n.
  1. A developmental anomaly of the skull in which the base of the posterior cranial fossa bulges upward.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.